PQRST is a regular polygon with 5 sides-pentagon n = 5, Each exterior angle = \(\frac{360^o}{n}\)
= \(\frac{350}{5}\) = 70^o
Each interior angle = 180 - 72^o
( < s on str. line) = 180^o
Since the pentagon is regular, the exterior angles are equal < R = 72^o and < S = 72^o
< RVS = 180^o - ( < R + < S)
= 180^o - (72^o + 72^o)
= 180^o - 144^o
= 36^o